Politeness Strategies in Lecturer-Students Classroom Interaction at the Biology Class Sanata Dharma University

---This study aimed to explain first, the types of politeness strategy used by the lecturer- students in classroom interaction. Second, the most frequent politeness strategies types used in Lecturer-students classroom Interaction The subject of this study was Biology class of Sanata Dharma University. This research used was qualitative study. The data were collected through observation. The findings of the study showed the followings: 1) The types of politeness strategies were used by the lecturer and students in classroom interaction. There were bald on record, positive politeness, negative politeness, and off record strategy. 2) positive politeness became dominant types (50%) of politeness strategies in teaching and learning process. It was followed by positive bald on record (32%), negative politeness (16%), and off record (2%).